Driving rain greeted commuters early Tuesday, leaving roadways slick and slightly limiting visibility.
The National Weather Service said periods of showers and possibly a thunderstorm were likely before 11 a.m., with scattered rain expected until noon.
Areas of dense fog also are possible, the service's Upton office said in a special weather statement.
Visibility could be less than a mile in some areas. The fog was expected to last until early afternoon, the service said.
New rainfall amounts could be between one-tenth and one-quarter inch.
The afternoon calls for clearing skies and the start of a warm stretch, with a daily high near 62.
The service said deep high pressure centered over the southeast brings light winds and mostly sunny skies to Long Island from Wednesday night through Friday morning.
Daily highs through Friday are expected to be in the high 50s to low 60s, the service said. There is a slight chance of rain later in the day Friday and into Friday night.